Sharp, fast-cutting white aluminum oxide abrasive with superior finishing characteristics. This is a stearated product designed to reduce loading with a full phenolic resin bond system to improve grain adhesion. Backed with a strong yet pliable 0.003 film back to provide a truly uniform finish. Film backing out-performs paper by a wide margin and lasts up to three times as long! These 5" Sanding discs are 320 grit Hook and Loop with a 8 hole pattern for dust collection. Comes in a pack of 100.